52 lines
1.3 KiB
Go
52 lines
1.3 KiB
Go
package ieproxy
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import (
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"net/http"
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"net/url"
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"golang.org/x/net/http/httpproxy"
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)
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func proxyMiddleman() func(req *http.Request) (i *url.URL, e error) {
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// Get the proxy configuration
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conf := GetConf()
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envcfg := httpproxy.FromEnvironment()
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if envcfg.HTTPProxy != "" || envcfg.HTTPSProxy != "" {
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// If the user manually specifies environment variables, prefer those over the Windows config.
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return http.ProxyFromEnvironment
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}
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return func(req *http.Request) (i *url.URL, e error) {
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if conf.Automatic.Active {
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host := conf.Automatic.FindProxyForURL(req.URL.String())
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if host != "" {
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return &url.URL{Host: host}, nil
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}
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}
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if conf.Static.Active {
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return staticProxy(conf, req)
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}
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// Should return no proxy; fallthrough.
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return http.ProxyFromEnvironment(req)
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}
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}
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func staticProxy(conf ProxyConf, req *http.Request) (i *url.URL, e error) {
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// If static proxy obtaining is specified
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prox := httpproxy.Config{
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HTTPSProxy: mapFallback("https", "", conf.Static.Protocols),
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HTTPProxy: mapFallback("http", "", conf.Static.Protocols),
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NoProxy: conf.Static.NoProxy,
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}
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return prox.ProxyFunc()(req.URL)
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}
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// Return oKey or fbKey if oKey doesn't exist in the map.
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func mapFallback(oKey, fbKey string, m map[string]string) string {
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if v, ok := m[oKey]; ok {
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return v
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} else {
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return m[fbKey]
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}
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}
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